Are they really identical images made after you configured them, or before? You can't duplicate an OS image after the weaved configuration has completed, as our server thinks they are all the same device.
If this is what happened, then you should edit the enablement files /etc/weaved/services/*.conf and delete the last 4 lines containing the UID and password in each file. Run
to restart all the daemons. Now, from a browser on a PC on the same LAN as your Pis, log into your account at developer.weaved.com. In your "My Services" list you'll see a green highlighted box for each detected unregistered service. Follow the onscreen directions to register each one.
If that's not what's going on, please tell me how you configured the first Pi.